S2, E4: Space Ghost welcomes shiny happy Michael Stipe from R.E.M. (Space Ghost: 'Is that you in the corner?' Stipe: 'Yes it is.') Later he shares time-honored difficult-places-to-reach-while-scratching-stories with Lassie. Mujibur and Sirajul frequent guest stars on 'The Late Show with David Letterman ' mysteriously appear with Space Ghost's pizza.