Get excited for what is sure to be a great episode of 'Running Man'!  There are three surprise celebrities to make guest appearances.

The filming for a new episode took place on March 21 in Seoul, and the production crew revealed that there was a mission in which the members had to go meet up with stars and get stamps from them.  As fans caught wind of this while it was happening, information has leaked about some of the stars to make appearances.

HaHa met with Yoo Yun Suk, Song Ji Hyo with Park Bo Gum, and Yoo Jae Suk withGirls' Generation's Seohyun.  It does not sound like they'll be that involved in the actual episode, but who knows?  You'll see when it airs on April 3.