▁prob es ▁that ▁are ▁capable ▁of ▁cons uming ▁d ung — an ▁abund ant ▁resource ▁already ▁explo ited ▁by ▁some ▁species ▁of ▁ro aches — to ▁generate ▁m eth ane ▁as ▁a ▁source ▁of ▁fuel . ▁ ▁Mul der ▁goes ▁with ▁Ber en baum ▁to ▁see ▁E cker le ▁at ▁his ▁facility . ▁She ▁stays ▁in ▁the ▁car ▁while ▁he ▁goes ▁in ▁the ▁facility ▁to ▁find ▁E cker le ▁who ▁is ▁in ▁a ▁h yst er ical , ▁par ano id ▁state , ▁having ▁been ▁unable ▁to ▁escape ▁the ▁ro aches ▁that ▁he ▁feels ▁are ▁following ▁him . ▁E cker le ▁pull s ▁a ▁gun ▁on ▁Mul der , ▁thinking ▁that ▁even ▁he ▁may ▁somehow ▁be ▁a ▁co ck ro ach . ▁S cul ly ▁arriv es ▁on ▁the ▁scene ▁and ▁meets ▁Ber en baum . ▁ ▁S cul ly ▁then ▁goes ▁in ▁the ▁facility ▁seeking ▁for ▁Mul der ▁and ▁then ▁ph ones ▁Mul der , ▁and ▁when ▁Mul der ' s ▁phone ▁rings , ▁E cker le ▁bel ieves ▁it ▁to ▁be ▁Mul der ▁making ▁a ▁tone ▁like ▁the ▁rest ▁of ▁the ▁unusual ▁ro aches . ▁E cker le ▁fires ▁at ▁Mul der , ▁and ▁his ▁sh ots ▁ru pt ure ▁and ▁ign ite ▁pip es ▁containing ▁m eth ane ▁gas . ▁The ▁agents ▁fle e , ▁and ▁the ▁facility ▁expl odes ▁with ▁E cker le ▁still ▁inside . ▁The ▁next ▁day , ▁Dr . ▁Ivan ov ▁arriv es ▁to ▁talk ▁with ▁Mul der ▁at ▁the ▁scene ▁of ▁the ▁explos ion ▁and