Have A Super Time

Finn Jones

Best known as Loras Tyrell (Renly Baratheon's lover and Margary Tyrrell's brother) in HBO's Game Of Thrones, Jones also played Santiago Jones in the Doctor Who spin-off The Sarah Jane Adventures alongside Matt Smith and former Doctor Who companion Katy Manning (Jo Grant). GoT fans: go glimpse the Knight Of Flowers in the flesh.

WHEN: 5 Apr, 10.30am–5.30pm & 6 Apr, 11am–5pm (photo opps, autographs, a general admission Q&A)

Michael Rooker

Since making his film debut in 1986 playing the title role in Henry: Portrait Of A Serial Killer, Michael Rooker's appeared in films such as Days Of Thunder, JFK, Mallrats and Hypothermia. More recently he played Merle Dixon in AMC's The Walking Dead and was cast as Yondu in the Marvel Studios film Guardians Of The Galaxy.

WHEN: 5 Apr, 10.30am–5.30pm & 6 Apr, 11am–5pm (photo opps, autographs, a general admission Q&A)

Lucy Lawless

The New Zealand-born Lawless first kicked ass as Xena, the Warrior Princess. She's also walked the Great Wall of China for Discovery Channel, played a reporter with a secret on Battlestar Galactica, makes Adam Sandler miserable as the villainous Aspen in Bedtime Stories, and was the sole survivor of the massacre in TV series Spartacus.

WHEN: 4 Apr, 8–9.30pm (Q&A, photo opps); 5 Apr, 10.30am–5.30pm (photo opps, autographs, VIP party at 8pm); 6 Apr, 11am–5pm (Q&A, photo opps, autographs)

Freema Agyemen

Agyeman played the role of Martha Jones in Doctor Who, a companion to the Tenth Doctor and a temporary member of Torchwood and UNIT. She reprised that role in series two of Torchwood. Martha Jones is notable as the Doctor's only companion who's a woman of colour – not to mention that she's an independent young professional who holds her own against the Doctor and knows her priorities. Agyeman has also appeared in Law & Order: UK and American series The Carrie Diaries.

WHEN: 5 Apr, 10.30am–5.30pm & 6 Apr, 11am–5pm (photo opps, autographs, a general admission Q&A)

Alexander Ludwig

The Canadian 21-year-old played Stanton in the 2007 fantasy film, The Seeker: The Dark Is Rising, the lead role of Seth in Disney's Race To Witch Mountain in 2009, and the male tribute from District Two, the bloodthirsty Cato, in The Hunger Games. Interesting fact: Ludwig, along with Jennifer Lawrence and Josh Hutcherson won Best Fight at the 2012 MTV Movie Awards.

WHEN: 5 Apr, 10.30am–5.30pm & 6 Apr, 11am–5pm (photo opps, autographs, a general admission Q&A)