It was revealed in the Marvel Animation panel at the 2009 San Diego ComicCon that Deadpool would make an appearance in the second season the animated series, Wolverine and the X-Men. [SOURCE]
SDCC 2009: Deadpool to Appear in Wolverine and the X-Men Season 2
It was revealed in the Marvel Animation panel at the 2009 San Diego ComicCon that Deadpool would make an appearance in the second season the animated series, Wolverine and the X-Men. [SOURCE]