Season 1: 4 times
106: Love- Once
108: Escape- Once
118: Missing- Twice

Season 2: 4 times
201: Hard Landing- Once
211: Psychic Pilgrim- Three times

Season 3: 7 times
311: Walk On By- Once
317: All Good Things- Twice
318: Third Party RipOff- Once
320: Playing With Fire- Once
321: On Borrowed Time- Twice

Season 4: 17 times
401: Getting Out Of Reverse- Once
402: There Are No Missions- Once
404: Into The Looking Glass- Once
405: Man In The Middle- Three times
407: Sympathy For The Devil- Twice
408: No One Lives Forever- Once
416: Catch a Falling Star- Once
420: Face In The Mirror- Twice
421: Up The Rabbit Hole- Four times
422: Four Light Years Farther- Once

Season 5: 5 times
507: Let No Man Put Asunder- Three times
508: A Time For Every Purpose- Twice