[2] Milligan is known for playing the role of Ted Mullens on Schitt’s Creek and Ethan Ward in The CW's 90210, a spin-off of the 1990s primetime drama Beverly Hills, 90210.

[4] Milligan starred in the short-lived primetime suspense drama Runaway, picked up by The CW for its inaugural season in September 2006, but cancelled in October after only three of nine episodes completed had been aired.

[6] He has also had minor roles in the television series The Days, Andromeda, The Dead Zone, Alice, I Think, Supernatural and the CBC's Da Vinci's City Hall.

[9][10] In 2012, he starred as Sam Reed in the Lifetime Original Movie Love at the Christmas Table co-starring Danica McKellar.

[13] In 2014, Milligan starred as Detective Reverend Grizzly Night-Bear in a vintage 1970s "buddy cop" movie Bad City.

Hugo Friedkin, a dimwitted government agent working with Riggins, in the BBC America series Dirk Gently's Holistic Detective Agency.